How do I get a number from a string in python?

Question

Need help guys,

s = "I waited 60 minutes. I cannot wait any longer. My home is 20 miles away."

How to extract the number which has minutes next to it. Then divide the number with 2 and get this below string as output,

“I waited only 30 minutes. I cannot wait any longer. My home is 20 miles away.”

“60 minutes” should be replaced “only 30 minutes”. Instead of 60, there could be any number.

Answer 1

Another method using for loop,

def isnum(s):
    res= False
    try:
        n = int(s)
        res = True
    except:
        pass
    return res

s = "I waited 60 minutes. I cannot wait any longer. My home is 20 miles away."

j = -1

s_list = s.split(' ')
res = ""
for i in s_list:
    j += 1
    if isnum(i):
        if s_list[j+1] in ['minute', 'minute.', 'minutes', 'minutes.']:
            i = str(int((int(i)/2)))
    res += i + " "

print(res)